©2003 Rolls-Royce plcThe information in this document is the property of Rolls-Royce plc and may not be copied or communicated to a third party, or used for anypurpose other than that for which it is supplied without the express written consent of Rolls-Royce plc.This information is given in good faith based upon the latest information available to Rolls-Royce plc, no warranty or representation is givenconcerning such information, which must not be taken as establishing any contractual or other commitment binding upon Rolls-Royce plc orany of its subsidiary or associated companies.

LNG fuel in RoRo-vessels

A practical example from ships under contract forSeaCargo

Arne MortensenRolls-Royce Marine AS

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Gas fuelled RORO vessel for SeaCargo

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Two alternative system configurations are defined by IMO

1 ESD (emergency shutdown) – protected machinery spaces:

Arrangements in machinery spaces are such that the spacesare considered non- hazardous under normal conditions, butunder certain abnormal conditions may have the potential tobecome gas hazardous.

2 Inherently safe – gas safe machinery spaces:

Arrangements in machinery spaces are such that the spacesare considered gas safe under all conditions, normal as wellas abnormal conditions i.e. inherently gas safe

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Gas fuel storage below deck :

- Minimum, the lesser of B/5 and 11.5 m from the ship side- Minimum, the lesser of B/15 and 2 m from the bottom plating- Not less than 760 mm from the shell plating.

For vessels other than passenger vessels a tank location closer than B/5 fromthe ship side may be accepted, on a case by case basis.

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Propulsion system for Sea-Cargo Ro/RO vessel:

- LNG tanks: Cap. 2x216 m³ / L=17m / Dia = 5 m- Endurance Approx 3400 nm at service speed ( 16 kn)- Main Engine ( gas only): RR B35:40 12PG, MCR 5250 kW

- Reduction gearbox: RR 3000 AGHC K 560- Shaft generator/motor: ABB 1600 kW- Propeller system : RR Kamewa CPP Dia 4,2 m

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“Gas Only “- engines

If completely segregated gas supplies to the main engine is notpossible, the following might be a possible solution:

On the RO/RO vessel for Sea-Cargo the shaft-generator will be run asmotor (PTI/PTH).

The requirement for such secondary power is either 40% of installed poweror according to DNV Pt.6 Ch.19 Sec.2:

The emergency propulsion system power capacity shall be such that it, asrecovered after any failure will enable the vessel to maintain a speed ofnot less than 7 knots except for single failures in acceptable commoncomponents.

In addition, the emergency propulsion system power capacity shall besuch that it, as recovered after any failure, will enable the vessel to remainin position in wind speed of 17 m/s (33 knots) and significant waveheight of 4.5 m (15 ft) with 7.3 seconds mean period, both of which areacting concurrently in the same direction, except for single failures inacceptable common components.

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General arrangement of LNG tanks and machinery

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General arrangement of LNG and machinery, plan view

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Arrangement LNG tank storage room, ventilation andbunkerstation

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Section aft of LNG tank

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Tank room arrangement

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Fuel gas propulsion machinery

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Engine room, plan view

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